I thought so, so can most 18350 modes hold a 18490?
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18 is the diameter in mm. The 3rd and 4th numbers are the length, again, in mm. So, a 18350 is 18mm X 35mm and a 18490/500 is 18mm X 49/50mm. Where I'm going here is that with a 18500, the mod will be approximately 15mm, or .600" longer than in 18350 mode.
Most tele tube mods will hold anything from a 18350, 18490, 18500 and 18650 through the use of a threaded, telescopic tube, or by, as previously mentioned, variable tube lengths that may or may not be included with the mod.