No, the Elgato Wave:3 is not compatible with the Elgato Wave XLR Pro.
Elgato Wave:3 is a USB-C condenser microphone for direct computer connection. Wave XLR Pro accepts only XLR microphone inputs — its USB-C port is a host interface for computer connection, not a USB audio input. Despite both being Elgato products, the Wave:3 (USB mic) and Wave XLR Pro (XLR interface) serve different signal chain architectures.
What works instead
See all compatible microphone for the Elgato Wave:3 →“Microphone 1 (XLR, Mono) Microphone 2 (XLR, Mono)”
“Wave:3 MK.2 USB Condenser Microphone 4.8”
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Confidence: high confidence