Can Wellbutrin 150XL be combined with Wellbutrin SR100 mg?

I used 150XL for long time. But now I feel like need more. I used before two 150XL , but I had headaches. So my doctor changed to SR150 (morning) and SR 100 (night). Like 150 XL had been pretty well, I would like to combine XL 150 in the morning with SR 100 at night. Can I do that?
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