93 Suburban Hvac Blend Control Actuator

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Hey hows it going guys? New to the site. I have a question that someone might be able to help me with. I have a 93 Suburban and my AC is blowing luke warm up front with the occasional cold blast here and there but the back almost consistently blows cold. So ive gathered from reading other posts that my blend door actuator is bad. So if my assumption is right i want to replace it. I went to the junk yard and took off what seemed to be 2 of them. The dash was off the truck at the junk yard so i know that i got the right part but 2? So what im not sure of is, are they both for the same function or does one control a different part of the ac? I dont know which one to replace.

 

Thank you