R5 kernel on an R4 card? possible/impossible?

Is it possible to use an R5 kernel on an R4 card? Or is the card itself a significantly different piece of hardware?

You're either talking about R4, or N5.

with few exceptions, it is not possible to use the firmware from one cart on another.

Loonylion->WITH FEW EXCEPTIONS<-, it is not possible to use the firmware from one cart on another.

And those may be? :3

ysmenu from DSTT

Thanks people. Anandjones, you were right, I did mean N5. In Australia, you can buy an R4 at Dandenong Market for $30. AU (comes with 2GB micro SD loaded with 88 roms) or the N5 for $50. (I think they must use a 4GB card because the bloke told me there was 184 roms pre-loaded).

Replying to #6

LOL, your close to where I shop there every now and then-got my psp SD adapter from there XD