I'd say the corn patterns and colors are just corns being snakes and varying as they will....look at the things WE did with them....I'd think they were still corn ....
actually in the wild rats and corns do mix,,,but I think it is so very few......they know to breed their own kind....
examples...in the early 90's I put milks together to breed for cool projects...none bred...like sinaloan to pueblan or anulata, or anulata to eastern, or amaura to stuff,,and elapsoides to easterns.......none would cross....they knew better....(even tried corns to milks and kings got 0)...(the only one that did breed was stuarti x honurensis)...so...
anyways......patterns and colors very even in one spot in the wild...here in PA ,again, in the 90's...we would look for snakes in one spot...a small quarry with trash ....find garters alot....usually the checkered with or without stripes ones...some all striped and some all checkered...usually greens and yellow tints like normal easterns....but we founf a pair with orange stripes down the back....and pairs almost black overlayed.....so...even within a couple hundred yards ,,,snakes vary....
so good luck....
personally I hate ultramel stuff...they act stupid and wicked....flighty,,,bitey and just ...not cool....
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........JY