The difference between the two is very minimal at best. One is the alpha isomer, the other the beta isomer. They both convert via steroidal enzymes 3b-HSD and 17b-HSD into DHT.
3-Alpha is androsterone (MMV3)
3-Beta is epiandrosterone (stanodrol).
Again both androsterone and epiandrosterone are pro-hormones to DHT. MMV3 is actually one of LG products that I like.