Speedmaster big block heads PCE281.2153 Vs. PCE281.2140 Diffs?

One number is for a hydro roller, the other for a hydro flat tappet.
Speedmaster makes a edie rpm copy, and a victor copy. The victor copy uses big offset rockers. You will have to use the questionable quality speedmaster rockers, or....
Pony up for some outragiously expensive rockers from somebody else. Harland sharps for victors will cost MORE than the heads.
Edit: i think you can tell them apart by the ends of the head . Rpm copys are plain, the victor copys have a freeze plug. Do NOT hold me to this info, i said "i think". Lol