Both of them could have a HMD. But if im correct then Gripen C has 8 pylons. A now in gave have 7, which the 7th is used for targeting pod. On C the 8th one was also used for extra fuel tanks, pods, but could also carry 1 extra bomb. Sadly no A2A on it. So i think these will be the differences on them. Not so big.
Now dont know about the weight and engine and other things.
Dev could add placefolder infrared Air-to-Air Missile with IRCCM on Gripen C from Swedish & SAAF because currently gaijin not ready 5th generation infrared Air-to-Air Missile
The C2 Ariete upgrade could be called the C3 Ariete.
C3 Ariete will have modification to turret for APU installation, better turret ammunition storage and hard-kill APS.
Italian Army is interested in the C3 Ariete variant but budget is the issue, especially after the Leopard 2 acquisition deal.
AFAIK the worst missile mounted on the SAAF gripen is the A-Darter, which makes the R-73 looks like a minecraft firework and the IRCCM of a mike like the corporate looking for difference.
This is the sparviero, mounted with a DARDO CIWS. The DARDO has twin 40mm bofors guns that is quite popular on frigates since it is one of the lightest western CIWS systems, operated by a variety of countries who operated light frigates and gunboats.
Credits: Gszabi
I hope that Gripen will get some Czech cammo for it. As we had some interesting one. (Personaly i hope it will be the Swedish one as i dont have top tier for UK, so i wouldnt be able to get them there)