Any chance there could be issues with cabin luggage on EasyJet?

[Mumbunz]

We're gearing up for our EasyJet flight and decided to add an extra 23 kg luggage to our ticket. Our ticket already includes an under-seat bag, meant to be around 45 x 36 x 20 cm, as EasyJet specifies. I've recently picked up two suitcases from Amazon, but they're actually 33 x 20 x 55 cm. Do you think they'll be fine for our flight, or is there a chance we might have issues with the size?

But it was posted in response to a poster who had that exact experience.