I'm pretty sure it would get rejected... although Telus is the umbrella company, Koodo is pretty much independent. If you made a mistake and it is accepted though you can always contact Telus and have them refund the money.
Well, to test it, I sent a small amount to TELUS Mobility using a Koodo account number. The payment actually posted to that Koodo account. This is not really surprising because Koodo and TELUS account numbers follow the same sequence. Nice to know this useless information. I am the original poster.