Doepfer

So have 2 A-196 PLLs that i've been fooling around with -Raul's World of Synths latest video on the A196 pushed me to play with them today. I never bothered to ever compare them. Each one's oscillator is tuned differently. I can't get them to match. One is lower than the other. With each's controls identical, they sound different. Is this normal? It can't be. There must me some sort of calibration or trimpot inside. What do you think about this and how can I get them to be tuned identically?  Thanks
-MAtt