I do not think so but it could have been the difference between the older MMP green sabot and the newer sabot. I do not have of either here in the house anymore but if I remember correctly the newer formulation is a little longer.

'Although' there was a time that TC was using Harvester as their supplier and Hornady was actually making their own but that was back their a bunch of years. I can not remember when the SST/SW hit the market but it does not seem that long ago...

This chart shows some of the different measurements....