123 to Trcastle vs 130 to Cadwell according to Google Maps. That's from Banbury itself, your mileage may vary as they say! But pretty even stevens...
Yes, strangely Google seemed to think Trecastle would take almost an extra hour compared to Cadwell.
A second look suggest maybe only 10-15 mins longer if I put a more honest route in for both - so you're quite right.
About 2h 45m to 3h for both.
Both fine rides. And the Welsh way will be quieter traffic / more open roads beyond Worcester.