I'd have to double check but its quite likely. 152mm being the popular Soviet/WP large artillery caliber which Ukraine no doubt has (or had, at the beginning) a lot of legacy Soviet-era heavy artillery.
The only thing I could find about Greece is Germany giving 40 Marder APCs to Greece so Greece could give 40 BMP-1 to Ukraine.
I'd have to double check but its quite likely. 152mm being the popular Soviet/WP large artillery caliber which Ukraine no doubt has (or had, at the beginning) a lot of legacy Soviet-era heavy artillery.