HIGHLY HIGHLY recommend the DX romhacks you're referencing, IMO they enhance SML/SML2 to the point where it's just better to play the hacks instead unless you're stuck on a monochrome GB.
Super Mario Land DX - https://www.romhacking.net/hacks/4477/
Super Mario Land 2 DX - https://www.romhacking.net/hacks/3784/
(Original ROMs to patch required, not at same site.)