I liked what you were doing with the SNES template since it was a combination of my vertical template mixed with more of a retail PAL feel to it.
I don't think you n64 template is different enough from your modified snes template. It looks like a snes cover with red instead of black. Also watch out for the publisher logos! The reason i didnt put the publisher logo on the red bar (separate from the coverart) is most coverart has the dev logo on the art. Some covers its easy to separate ... most is very difficult to remove.
I agree with Azarkhel that having the yellow, blue, green & red would help differentiate it from the snes template and capture the n64 feeling better. I struggled a lot when making the Vertical N64 template we have right now because it was hard to capture the original feel of the boxes mixed with something that still looks appealing. I could have just changed a few logos and colors on my SNES template but since the art style of the N64 and SNES were so vastly different I felt the vertical iterations should be just as different.
Don't be afraid to try something entirely different. Play around with different layouts and don't be locked down to your current template. Have fun with moving things around and it could really work out in your favor.

Also you may want to consider using the same size n64 logo on the bottom part of the spine. I kept my white box the same size so it would still line up with the horizontal style. That way its make it more uniform if people decided to mix and match or slowly convert over to Vertical.