Philco 90 speaker replacement

[tab10672]

A friend of mine needs a speaker for his single 47 model 90, I have a spare model 20 with dual 71's according to a chart I found the plate load for a single 47 is 7000, 2-71's is 8000. With 1000 ohms higher impedance on the pri. of the transformer will this speaker work ok or will the load differance effect sound quality or tube current to the point of failure?

Thanks, Todd