Nick Millman writes in "Real Colors" that "ANA 505 Light Yellow superseded Lemon Yellow and is approximately similar to FS 13655 (which also superseded it in March 1959). However, 505 is noticeably lighter, brighter and less 'orange' than FS 13655.
I have MRP-386 whuch is labeled as FS 13655 / ANA 505. I don't know if it matched to FS 13655, probably it is. Is it possible to make a yellow paint less orange by mixing it with some other colour? At some point, maybe ever for my SB2U-1, I will need Lemon Yellow, I would like there to be a noticeable contrast between the wings and the Lemon Yellow parts. I'm planning to use Mr Hobby C329/H329 for the US Navy Yellow. Maybe there is already enough contrast between these two colours. My DSPIAE colour test cards haven't arrived yet, they would be very handy for situations like this, when deciding what colours to use.