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Yes, there is, but it requires some modding.

First open both tf/scripts/hudlayout.res files from both HUDs.
Then copy the crosshair part you want to use.

Second, open the tf/resource/ClientScheme.res, again from both huds.
Find the part where the fonts are defined. Copy&paste the font your crosshair uses.
You might need to add a custom font file (at the bottom of the clientscheme file), if you don’t want to install the font by right-clicking. And of course add the required font file to your tf/resource/ folder.

Not sure if this has been asked but does anyone know how to bring a hud xhair from one HUD, into another hud as an achievement tracker xhair?

Edit: Got it working from help here at these 2 links:

Garm3n’s explanation on moving Xhairs
http://www.sdx-gaming.eu/?page_id=849/garm3nhud/garm3n-hud-and-overlay-crosshairs/

hud achievement crosshair guide
http://teamfortress.tv/forum/thread/4134/1