Whoa there, brother...Why would you want a slug P90 in a Junior? And the tailpiece is a throwback to old-school (which is sought after by many. Self included.) as well as the inlays. Pearl dots in a Junior? Don't be silly.
Why wouldn't you want a slug P90? they sound fantastic. you have them in your '14 MM, no? the throwback tailpiece likely will not intonate as well as the lightning bar, and sure doesnt look as good as the satin nickel finish IMHO. And pearl over acrylic any day. I get the whole purist thing, but at some point it should be recognized the old-school Jr, while very cool, is not immune to improvements.
$1299 for a junior??
Get a studio model with a case.
https://www.sweetwater.com/store/detail/LPST17B6CHd1
or a tribute....which is even less money but a serious step up from a junior.
ETA:
Ta
that has to be a serious mis-print.
I wanted to show a pic of the 2018 LP Jr headstock. Although quite different, it is a pretty design.
...I intend on replacing the wiring with a Wolfetone Meaner P90 and wire it 50s style with TVT volume pot and a 250K tone pot. Your ‘18 Jr is likely brighter because it has a 500k tone pot - consider using original spec of 250k for tone. It really helps shape the mids and isn’t same as 500k half way.