Help! Dissimiliar sized ackies.

[Fitz19d]

I was under the impression a couple of ackies I ordered from 2 different places would be closer to the same sized.

One is loosely ID'd as a female/one male, but both sellers werent 100% sure so could be double of either.

Either way, at this size diff., should I put them in seperate tanks or if they arrived same day may acclimate fine? I know no definate answer of them working as ackies I thought were hit or miss. But any for sure answer to not do it?

Also I know dont mix species, but I'll still throw it out there, would the one the same size as my very young tegu maybe work toghether for a little while?

I can red neck 3 tanks for each, but would be more convenient for now if I could do 2 for now.