No they dont.
Keys allow apps to be signed to run on X firmware.
Peek and poke aka syscalls : allows backup managers to load games.
on 3.55 is an eboot was signed with 4.11 key it would load via peek n poke within 3.55 cfw
on 4.11 you can mod it to have install pkg option, but no pkg will run as we cant sign them. even if it did run, 4.11 would need to have peek and poke remapped/rejiggled to work. afaik.
Last edited by DEFAULTDNB; 06-01-2012 at 10:07 AM.