Old Ws vs New WS vs SWS

So I have a older WS body(Lucy ver 1 to be exact) She has a broken arm I'm in the process of repairing & I have a character in mind for her. My question is I know that WS is like really white but yellows with age. I have a SWS head & the colors look like they almost match, the SW is just a bit more pink than the WS.

 

So my question is; Should I get a WS head for this body or a SWS? Or should I try & find a similarly aged WS head? Also, because her arm is broken(Her wrist peg & shoulder peg are broken off) should I get WS pieces or SWS pieces? Or just take the soft cover parts off the skeleton bits & put them on the new joints?

I'm not entirely sure but when we next see each other I can bring my Saber Alter. I've had her for a few months now brand new so she shouldn't have done any significant yellowing. I can also bring my snow Miku Yumi. She's fairly new semiwhite skin so hopefully this will help you.