Manley is gonna hate me but here goes ;)

As far as UV compatibility goes you would need to purchase something like these to if you want more than just M5 and V5 UVs for G2. You will find that most characters are built on the M5/V5 base so these are only necessary for characters that use other UV bases like Aiko, Steph, Freak etc

Generation 5 UV Bundle for Genesis 2 Male(s)

Generation 5 UV Bundle for Genesis 2 Female(s)

V4 and M4 Uvs are also available

For shapes you have:

**Generation 5 Legacy Shapes for Genesis 2 **

Generation 4 Legacy Shapes for Genesis 2

There are also clones available for better clothing fits each way to.

As Manley pointed out Morphs are pretty dependant on geometry so need to be built custom for each figure.

I have both Genesis and Genesis 2 Figures installed, and clothing works much better across these figures. Theres no reason to use either exclusively and I still feel each figure has its advantedges and still use Genesis quite regulary alongside the G2's.

My apologees to if  I helped this thread slip into a negative gear, I guess myself and Manley will just need to agree to disagree. No hard feelings mate :)