Were Courageous and Glorious equally capable?

Were Courageous and Glorious equally capable at the start of the Second World War?

Broadly yes, though Glorious was slightly more modernized and had a longer-established air group.

The two ships were near peers, with neither holding a decisive technical advantage. Glorious had been modernized a little further, while her air group had also been established for longer. Those differences could matter in readiness and experience, but they do not turn the pair into fundamentally different carriers. This is a useful baseline before following their alternate wartime assignments.