Is the Enphase IQ8MC-72-M-INT compatible with the Enphase IQ Gateway Metered (with 2x CTs)?

Yes — listed by the manufacturer.

The manufacturer's published pairing data lists these together.

Manufacturer's compatibility listListed together in the manufacturer's published pairing data. A cited document reference is being added as datasheets are processed.

Pairing details

CT specification
cts: 2x CTs included (grid + PV production) · note: For three-phase, order CT-3PH-KIT (3x CTs per metering point). Extension cable available from Enphase · type: Split-core, 200A (CT-200-SPLIT) · cableLength: 1m · maxExtension: 16m total (with 5m extension cable)

Both products

Design a system with this pair