If you’re happy with the Skylines, stick with them! They are great!! You’re spot on for the most part, the electronics and similar woods make a 55-01, 55-14, and 55-94 all about equal... especially when you run them through outboard gear... but that’s another drunken tirade! The difference is when you pop up things you can’t get on the Skylines... and that was the difference for me.
I find the difference between flat sawn and quarter sawn necks to be enough for me to want the US with quartersawn... I *think* the extra stiffness helps harmonics to “pop” just a bit more... that could be voodoo, but it’s my impression from playing 55-94’s & 55-14’s back to back. Additionally I really dig the growl of ebony fretboards on a 5 string... so that’s another pro in the US column for me...
Add to that, my “dream” bass was a 55-94 with birds eye maple too, no marker Ebony fretboard and black finish headstock, and when one of those came up it was completely worth it to move 2 skylines to snatch it up!
So- if you want to sell the 55-02’s to get the “standard” 55-94, you might not see much difference... if you want to take advantage of custom choices, you’ll see a lot!