Yes it is, as A Matter of fact, I Boot to Grub2, that Has Linux/Android(s)/Windows, I Click Windows, And I Have Windows 7, ANOTHER Android, I Click On Android and It Gives Me Android4.4/5.0 That I Created the Grub2win...
Basically set it up that way encase of a Grub Failure, So Far has been pretty handy, Mostly Grub2 is what get's fluffed, So Just restoring grub2 in Linux, Brings ALL back because the other 2 Aren't ever touched...
TBD