If you are planning to buy a 205. Then it has to be an IAP to join the cluster.
An IAP will not form a mesh link with controller based network.
If you buy an IAP 205 US, you can always convert it into AP 205 to work with controller and revert back to IAP 205 US, upon a factory reset.
Vice versa is not possible, due to country code regulations.
203H is a unified platform and can work with IAP-205-US.
The correct one you want to order for them to talk to IAP-205-US is:
JY695A Aruba AP-203H (US) Flex-radio 802.11ac 2x2 Unified Hospitality AP with Internal Antennas
See that its country code is US.
Make sure you upgrade the whole cluster to latest 6.5.x code available, to support the UAP.
I forgot to mention that we are located in Finland and our existing hardware is RW, so I'll go for the AP-203H-RW (JY693A).
Kindly make sure that you set the same country code on all the RW equipment. Else country code mismatch will not let the cluster to form.
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