Almost impossible to find two scales that will weigh you the same. But . . . that really doesn't matter . . . that's only a number. What matters is the direction of the movement . . . as long as it keeps on moving downward; you are doing the right stuff.
That said . . . I feel your pain and confusion
. . . same thing happened to me last Spring. New scale gave me a 5 pound gain. So, since I decided I was going to be using the new one from that point forward, I decided I'd have to consider it to be the correct one. Didn't consider it a gain, though . . . just a little plateau. . . . just left my ticker where it was until I caught up with it again . . .
Have a good moving and shaking day, chickie . . . Pick the number from the scale you intend to keep on using and then forget about the problem and keep on moving forward (and downward) on the long winding road to better health and fitness.