that's the one
I've seen a photo of the recovered recorder and lacking an external site to which I can upload the photo and paste a URL into this reply, here is the key info:
Photo of reels matches exactly, and if you peek around corner on the mag2.jpg file you can see a data plate which looks just like the one on the recovered photo:
Data Plate reads
MS-61B (reading S for the Cyrillic)
Series 286
No 13