Difference between Seas 1” tweeters 27TFFNC/G (H1396), 27TAFNC/D (H1397)

27TFFNC/G (H1396)is a soft dome, used on Linkwitz Lx521 and he crosses way up at 7khz.

27TAFNC/D (H1397) Is aluminum, and used in Zaph’s ZA5 auto setup. He crosses way down at 1.8khz.

Do you guys think there’s any real audible difference between the two? Could both be crossed way down at 1.8khz (LR4)

Last but not least what do you guys think of the Vifa/Peerless DQ25SC16-04 that Zaph uses in the rest of his ZA5 kits? (Again if I was thinking of crossing LR4 at 1.8khz)
 
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Well, there has been done some research concluding that all 25mm domes basically sound the same, if implemented well.
On crossing them low: the SEAS units have a bit more linear coil travel, which, theoretically would keep uneven harmonics somewhat more out of the way at higher levels. But I don't have a clue about your design goals there. All three of them could turn out well in the right design.