They don't seem the same to me and I'd hope they weren't. Washing kills the garment and I'd think the base layers would be dead very quickly from the washings they'd require.

Too pricey for me, plenty of quality undergarments out there that I'd pick first. Ones that washing wouldn't affect.

I only washed my scentlok once this year. Worked fine. Got busted once hunting in the same area as a pack of Mennonites. Found myself with a permanent head shaking affliction for a while.