I agree that you ought to be careful making that assumption.

Most reptiles exhibit indeterminate growth and will continue to grow as long as they are alive (we've all heard of extremely old and massive reptile specimens at the zoo that are much larger than the average adult of their species)

I'm under the impression that you can make an educated guess at the sex of the animal by looking at the ratio of tail length (e.g. from cloaca to tip) to body length (cloaca to head). E.g. if the tail to body ratio for the large snake is significantly smaller than the tail to body ratio of the smaller snake it is likely to be a female since males generally have longer tails than females.

I'd just put them together and watch them closely for aggressive behavior)

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