On a P60, the variance between those LEDs is only 8Kcd and the output is about 1/2 for the W1.1 The difference between the W1.1 and W2.1 in a smaller reflector will probably be even less, perhaps 5Kcd. In each case, I'd have go for the noticeably higher output and 5400K of the W2.1. The throw advantage for the W1/W1.1 seems to be greatest with medium/large reflectors and optics.
Yes, also curious if this is available with W2.1 & factory interface. Looking for a rear switch, 18650 thrower, 28mm head or smaller, 45+Kcd. VN4 probably puts this a little out of my price range right now.