Trade question - need opinions

I am working on this trade - this is not a for-sale post but a trade that is in the final stages of being finalized.

I am trading what I have: Malkoff Hound Dog MD3 XML2 (Neutral) with a high-low ring *for*a LNIB Malkoff M61T MD2 with the Tricap and high/low ring.

The M61T is LNIB, the Hound Dog has some miles on it but really close to 99%.

How much cash does the M61T need to add for this to be an equivalent trade? I understand the HD is a much more impressive light with 3 times the lumens but I have 2 of them (Hound Dogs) and I prefer the ‘regular’ one a bit more tint-wise, it has no hint of blue. M61T is an EDC candidate while HD is more of a outdoor serious device.
I looked at the malkoff site to get ballpark ideas but then have to figure the 10% or 15% discount.