I think the correct SNS is SNS-AZKE-USA (least according to GameFaqs)
Release year 1994 (legal text says 1992)
Game by Iguana Entertainment (legal text says game by Nintendo)
So I think the correct legal text would be:
1994 SUNSOFT. GAME BY IGUANA ENTERTAINMENT.
TM AND R MARE TRADEMARKS OF IGUANA ENTERTAINMENT.
1994 IGUANA ENTERTAINMENT.
I'd prefer non-bat sunsoft logo, or use the same size as you use on the spine also on front and back (if possible stay between white lines), also move back logo 1-1.5cm left.
SNS P AZKE is the correct number for the back as it matches the box scan. I also changed the legal text to more closely match the box.
1994 SUNSOFT. GAME BY IGUANA ENTERTAINMENT.
TM AND R ARE TRADEMARKS OF
NINTENDO OF AMERICA INC.
1991 NINTENDO OF AMERICA INC.
According to box its 1994 Sunsoft and 1991 Nintendo of America.
Finally i changed to the normal Sunsoft logo and added a drop shadow to the back logo. (Thanks for the hints on how to do that)