Question about Epson Premium Glossy Photo Paper

I use this paper with the Epson SC-P 800 with very good results. I assume it will also work with the SC-P 900.

Yes, it's on the official consumables list for the SC-P900:
Traditional Photo Paper, DIN A2, 325 g/m², 25 Blatt C13S045052
Traditional Photo Paper, DIN A3+, 325 g/m², 25 Blatt C13S045051
Traditional Photo Paper, DIN A4, 325 g/m², 25 Blatt C13S045050
Archival Matte Paper, DIN A3+, 189 g/m², 50 Blatt C13S041340
Archival Matte Paper, DIN A3, 189 g/m², 50 Blatt C13S041344
Archival Matte Paper - A4 - 50 Blätter C13S041342
Double-Sided Matte Paper - A4 - 50 Blätter C13S041569
Enhanced Matte Paper, DIN A2, 192 g/m², 50 Blatt C13S042095
Enhanced Matte Paper, DIN A3+, 192 g/m², 100 Blatt C13S041719
Enhanced Matte Paper, DIN A4, 192 g/m², 250 Blatt C13S041718
Enhanced Matte Posterboard, DIN A2, 800 g/m², 20 Blatt C13S042111
Enhanced Matte Posterboard, DIN A3+, 800 g/m², 20 Blatt C13S042110
Fine Art Cotton Smooth Bright 17" x 15m C13S450270
Fine Art Cotton Smooth Bright A2 25 Sheets C13S450276
Fine Art Cotton Smooth Bright A3+ 25 Sheets C13S450275
Fine Art Cotton Smooth Bright A4 25 Sheets C13S450274
Fine Art Cotton Smooth Natural A2 25 Sheets C13S450269
Fine Art Cotton Smooth Natural A3+ 25 Sheets C13S450268
Fine Art Cotton Smooth Natural A4 25 Sheets C13S450267
Fine Art Cotton Textured Bright A2 25 Sheets C13S450290
Fine Art Cotton Textured Bright A3+ 25 Sheets C13S450289
Fine Art Cotton Textured Bright A4 25 Sheets C13S450288
Fine Art Cotton Textured Natural 17" x 15m C13S450277
Fine Art Cotton Textured Natural A2 25 Sheets C13S450283
Fine Art Cotton Textured Natural A3+ 25 Sheets C13S450282
Fine Art Cotton Textured Natural A4 25 Sheets C13S450281
Matte Paper-Heavy Weight, DIN A3+, 167 g/m², 50 Blatt C13S041264
Matte Paper-Heavy Weight, DIN A3, 167 g/m², 50 Blatt C13S041261
Matte Paper Heavy Weight - A4 - 50 Blätter C13S041256
Photo Paper Gloss, 17 Zoll x 30,5 m, 250 g/m² C13S041892
Photo Quality Ink Jet Paper, DIN A2, 102 g/m², 30 Blatt C13S041079
Photo Quality Ink Jet Paper, DIN A3+, 102 g/m², 100 Blatt C13S041069
Photo Quality Ink Jet Paper, DIN A3, 102 g/m², 100 Blatt C13S041068
Photo Quality Inkjet Paper - A4 - 100 Blätter C13S041061
Premium Canvas Satin, 13 Zoll x 6,1 m, 350 g/m² C13S041845
Premium Canvas Satin, 17 Zoll x 12.2m, 350 g/m² C13S041846
Premium Glossy Photo Paper Roll, 16 Zoll x 30,5 m, 260 g/m² C13S041742
Premium Glossy Photo Paper, DIN A2, 255 g/m², 25 Blatt C13S042091
Premium Glossy Photo Paper, DIN A3+, 250 g/m², 20 Blatt C13S041316
Premium Glossy Photo Paper, DIN A3, 255 g/m², 20 Blatt C13S041315
Premium Luster Photo Paper, 16 Zoll x 30,5 m, 260 g/m² C13S042079
Premium Luster Photo Paper, 30 cm x 30,5 m, 260 g/m² C13S042078
Premium Luster Photo Paper, DIN A2, 250 g/m², 25 Blatt C13S042123
Premium Luster Photo Paper, DIN A3+, 250 g/m² C13S041785
Premium Luster Photo Paper, DIN A4, 250 g/m² C13S041784
Premium Semigloss Photo Paper Roll, 16 Zoll x 30,5 m, 250 g/m² C13S041743
Premium Semigloss Photo Paper, DIN A2, 250 g/m², 25 Blatt C13S042093
Premium Semigloss Photo Paper, DIN A3+, 250 g/m², 20 Blatt C13S041328