OK take this with a grain of salt and I am NOT getting to specific details
but for many many many yrs I knew a person that handles seeds,m up and down the eats coast, from HI way seeding jobs, to selling bulk seeds and he SOLD the same seeds to many deer seed company's as he did to basic Ag stores
the difference was more in there coating and NOT a special seed at all
and mostly was just a different color of the coating to be THERE color
SO on this note, , you take it as you like
I have planted BOTH and have even gone as far as planting side by side to see if there was any difference on several properties
and NEVER once seen any deer or any other critter FLOCK to any one brand seed
they ate MORE where they felt safe, and or the crop grew better(better soil conditions in that spot)
and NEVER ever seen one brand grow better in same like soil conditions
I was also one of the whitetails Institutes first plotters in PA, from 1988
there is NOTHING wrong by any means with there seeds, minus there added costs

THE next thing, some seed comopanys(deer brand seeds) MIGHT have a PERK on, is how much WEED seeds is in there blend as to basic CO OP farm store seeds
but again, IMO< weeds are going to happen no matter what you plant, as things seed up, and seeds fly off as they bud off and drift in the wind, and GOD know's how many seeds to turn over prepping a site with any type of tillage you do!
SO< weeds are a issue for 90% of all plotters and this is also an area where there are BRAND name chemical and Generic brand one's that, IMO< work as well at a large savings, just like on seeds!


so, IMO< these are deer your feeding, unless you have a TON of land say 2500+ acre's where you can really control age structure of YOUR herd, and or NEIGHBORS all on same page with your management plans
any LONG term benefits some company's CLAIM, are not even possible for anyone in the real world!
so if buying for so called higher protein levels and such, your wasting time if you cannot control age structure of the deer herd you hunt/manage!
which IMO is about 80% of most hunters that CANNOT do so!

NOW as for mixing all them seed together
yes you sure can, but odds are you will have a less than stellar take on ALL of them, over say having ONE or two things grow very well!
the idea sounds great on paper, but seldom works out in the real world if you follow

you are way better actually planting either one or another, and if you WISH to have better attractant for hunting, plant for hunting, if you just want early season food, plant for that, and you always have the option to KILL a early season plot and plant a fall plot
you can do cheaper things to do this
like buckwheat for spring, ad clover at planting if you like? or rye grass!
then burn it down and plant a fall plot for hunting over
more work, but will yield you better results!
Buckwheat will also keep the soil very easy to re plant, and attract turkeys pretty strongly, for sporing gobbler season! peak at about late June, can burn down in late July and plan t a fall plot for Sept on!
being in a very heavy crop land area, your plot will also pull better come hunting season, when all crops are being harvested and you have a PRIME food source

farm lands tend to have rotating crops, with winter wheat being common in most places, which will feed nursing does and fawns and all bucks left!
since you cannot hunt deer at this time of yr, honestly, if you wanting a deer plot , the fall plot should be your main concern IMO, they will have plenty to eat come green up and at a 1/2 acre plot, they will NOT over browse it on you , which can happen