6783371 is a ROTAX 912 ULS (912 ULS2) produced 21-May-2014
original factory configuration:
without fuel lines
UL2 I=2,43 with clutch
without vacuum pump
with green valve covers
without mech. tachom. pick up
without external generator
without air guide baffle
with std. temperatur sensors
with nipple conn. for oil pump
with expansion tank
without air box
bent sockets for engine truss
starter large
4425204 is a ROTAX 912 ULS (912 ULS2) produced 09-Feb-1999
(No additional information is found in the factory database)