Actually, some 3000's with 108 mHz scale were made, but they are not as common as the one with 104 mHz scale
I don't know if the tuner (variable capacitor) is the same on the two, it is likely that your tuner is only made for going to 104 mHz.
Beocenter 9300, Beogam CD50, Beocord 5500, Beomaster 3400, Beomaster 4400, 2 Beogram 4000, Beomaster 8000, 2 beogram 8002, Beovox S-75, Beovox MS150.2, Beovox RL6000, Beovox S-35, Beomaster 6000, 2 Beocord 9000, Beocord 8004, Beocord 5000, Form 1, 2x Beolink 1000, Beo4, MX3500, LS4500. Born 1993.