We will call it MEGATRON and it shall stand like a monument to your madd skillz.

If the 2 F1s are different you still have a multiple-hybrid.
2 different SOURCES of a stabilized line SHOULD give you essentially the same plant, just worked in better. I'd do this to add vigor to an old line. I'm about to start working with this with my 2 lines of Alaskan Hippie Weed.
I'd also like to try backcrossing a line of VT hippie weed locally known as 'green lifesaver' which looks to have some strong NL heritage with its NL ancestor to bring it back into more of a houseplant, lol... she's a big wild untamed sasquatch beast atm... needs to be housebroken!