Think its down to what region your console is from, PAL or NTSC. PAL is usually European/Australian territories and NTSC is USA/Asian territories. A PAL game will not work on an NTSC console and vice versa. *** carts will work on a US N64 because they are both NTSC, but the carts have different sections removed on the back, preventing you from inserting them. You can get round this by removing the tab inside the console, or taking apart the cart, removing the ROM board inside and either plugging in the bare circuit board (chips facing the back of the N64) or place it in an empty cart shell from a game that fits into your N64.

From my collection, what I believe to be rarer titles.

Remove the Beta drivers and install the 'official' 163.75 I have run Crysis with both and I see no difference in frame rate. I got same BSOD with the Beta drivers installed, had no probs since using 163.75

If you mean 'Can you use a SNES scart on the N64' then the answer is yes, but only as long as it has the Composite pin wired up (most cables have this) the socket on both the N64 and SNES are the same size and shape.

However if you want the best picture possible (RGB) then it is NOT available on a PAL N64! The only N64s that can output RGB are early US NTSC models which have to be converted internally. A PAL SNES does output RGB but proper RGB cables are very hard to get hold of. The best way to do it is to buy an official Nintendo Gamecube RGB Scart lead (the best quality IMO) open it up and unsolder the capacitors (3 in all) Some people think that the picture is too bright with this configuration, so the answer is to add 3 resistors where the capacitors were (40-50 Ohms) your PAL SNES picture will be clear and vibrant!

So YES via Composite. NO via RGB to answer your question

Hope this helps.