While I've not used those caps or resistors in any of my mods, both are reportedly very nice. I've used various VH Audio products over many years, I can assure you all very nice quality. As for those mods with the CW, I have extremely diy modified Khorns, while I used different caps, Jupiter and Audyn for my mods, these and the numerous other mods made all the difference.
Based on info you've provided I wouldn't expect the general character of the CW's to be changed by this relatively simple mod. Generally you're going to make the greatest change with Heritage models with changing from shallow slope to steeper slopes, horns can make a great deal of difference as well. For instance I could have gone to the ALK steep slope crossovers in the Khorns but wanted to retain the original Khorn sound so used a Crites Type A crossover which I modified with the film caps noted above, Jantzen inductors, Duelund point to point wiring. I also changed out all three drivers, added Volti horns for mids, tweeter driver on custom baffle. So even with these extensive mods, modded Khorns simply improved upon the original, didn't change the character wholesale. I'd go for those CW's over any stock CW's, you can expect more natural timbre, likely a bit more resolution/transparency with those mods vs stock.