No. They aren't the same. The SCA skimmer's air draw is 450lph and the BM's is 300lh. You'll notice a difference. What size system are you trying to find a skimmer for? Is this your 150 gallon? If so, neither of those skimmers will work for you. I wouldn't even feel comfortable running both of those skimmers simultaneously on a reasonably stocked 150+sump.
If money is an issue, look for a used skimmer. I would aim for something with at least 1000lph air draw.
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thanks,
Doug
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