question about plywood for Alpair 11ms dMar-Ken

Dear forum, I recently order to Dave from planet10 the planset to build the diamond shape for the 11ms. I had some leftovers of baltic birch plywood 18mm, but no enough to do this project, so I went to my local store and ordered some cuts. But they did not use birch, but PINE instead. Much lighter and not so dense, but it is a pity to have it cut for nothing (even if they gave the money back...) So my question is, shall I use that material or just pay for the baltic birch?

I attach photo of the material. Thanks all!
Captura%2Bde%2Bpantalla%2B2020-12-28%2Ba%2Blas%2B14.43.29.png
 
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