The piano appears to have no late reflections in its recorded sound, so either:
- there weren't any to record or the microphones were of such a type or in such a position so as not to record them.
The trumpet does have late reflections in its recorded sound so:
- the microphones were of such a type or in such a position so as to pick them up.
Based on what I have learned here about microphones I would therefore suggest that:
- the piano mics were closer to the instrument and/or more directional
- the trumpet mics were further from the instrument and/or more omni-directional.