Did the imperial armored commandos shown in Mando S3 exist during the Galactic Empire?

They’re definitely based off of the mandalorian super commandos from Star Wars rebels, but is it possible for them to have existed during that time? I see the empire using special forces such as the armored commando. I think it would’ve made sense the empire harvested mass amounts of Beskar during their reign on the planet and given how limited the imperial remnant’s resources are, I feel like they would’ve just reused assets from the galactic empire that worked rather than make something entirely new.