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I don't have a pic, but the pinion for the 9" will have a nub that sticks out beyond the gears for a third bearing, the D44 won't. If you have both ring gears side by side the 9" will be larger.
Confirming what is above... The 9" pinion is easy to tell apart because it uses an extra support bearing that goes at the end so it has a bearing surface that sticks out beyond the gears. The 9" ring gear diameter is also 9" while the D44 is something less than 9.
If I can get them both in one place I'll take a pic of them. (I know I have both here)
To further add what they are saying, the 9 in. will have a bigger ring and pinion gear compared to a D44 of a similar ratio. The pinion will also have a lot longer teeth than a D44.