Although it may not be the answer you were looking for, this was answered on the Maples forum :-)

As one of the better JM websites states: There are things that are absolute in life such as death and taxes.
Unfortunately being able to visually identify a specific Japanese maple
cultivar with 100% certainty isn’t one of them. There are several
reasons for this. First, your tree may be seed-grown guaranteeing that
it is not a named cultivar. Many older trees that may have been grafted
lose there graft “markings so it is impossible to tell whether they are
seed grown or not. Second, many Japanese maples are similar to each
other in color, leaf type and many other visible ways. The actual
differences in many cultivars can be very subtle. Even with the ones
that are VERY distinctive you cannot guarantee an ID although you could
give a “likely” ID. There are also many differences brought about by
environmental conditions that could also make the actual subtle
differences in appearance even more obscure. Finally, the number of
different cultivars that have been produced over the years is
astonishing and may possibly number a thousand. A person would be hard
pressed to know all of them in any intimate way. In my opinion it would be
unethical for even the most expert old-time Japanese maple grower or
even J.D. Vertrees himself to give a 100% guaranteed ID on any Japanese
maple.

The main reason I'm asking is I live in zone 6 Louisville ky. It gets really hot here in July and Aug..90+ and ive read that one does better in full Sun than the other.. Any ideas on that?

I just seen where you answered on maples forum...lol. Thanks