There seems to be a great deal of confusion regarding these papers.
This is what I thought to be right:
Fotokemika EMAKS = graded chlorobromide paper, slight warm tone, aka J&C Nuance, Adox Classic Arts. (I have a box in the DR, so I'm quite sure of this one)
Fotokemika VARYCON = variable contrast, slight warm tone (as I remember it), medium weight paper (as I remember it).
Adox VarioClassic Fine Print FB = variable contrast, neutral tone, triple weight paper. (Have several boxes and rolls in the DR, pretty sure about this one.) Rumor says it's based on old DuPont formula.
As I understand it, there is no EMAKS Varycon.
Don't take this as the absolute truth, since I'm not quite familiar with rebranded products sold under different names in the USA, but this is what I know, and it comes straight from the horse's mouth, so to speak
(i.e. my source of info comes straight from Fotokemika in Croatia):
Fotokemika in general produces 3 types of paper, sold in Croatia under three names:
1) EMAKS is graded paper, in FB and RC variants (it has slightly warm tone)
(Paper named EMAKS is ALWAYS graded paper!)
2) EFKEBROM (mostly FB, AFAIK) = bromide paper, pure white base (not produced regularly), graded paper
3) VARYCON = multigrade paper, in FB and RC variants
All three types of paper are/were produced in two variants, I think - FB and RC, and FB papers are of "full-weight" (karton) and "medium-weight (polukarton) variants. (I'm not sure about EFKEBROM - it might have been produced only as FB variant.)
Full-weight is thicker, full FB, while medium weight is - well - medium weight
There are also three types of finish - "kristal" (or "Pearl"), "sjajni" (glossy) and "mat"...
EMAKS comes in three grades - 1 (soft), 2 (normal) and 3 (hard).
That's it. There are some extra batches of other papers now and then, but, AFAIK, the only multigrade paper they produce is VARYCON - only one type, one formula.
There was also "Chamois" - they don't make it any more, which is a shame - it was lovely warm tone
I'm not sure under what names these papers are sold abroad, but that's mostly it. So, there are really no different types of Fotokemika's VARYCON paper with different formulas... Maybe the second multigrade paper mentioned is from another manufacturer?
PS: attached snap shows three main variants - EMAKS, EFKEBROM and VARYCON in their original Croatian packaging.
Hope this helps,
Denis