I match the input stage, top and bottom and the mirrors, top and bottom. Absolute hfe is uncritical so even a 300/300 match is fine. 10% match in each functional section is good enough too. I can tell you even something : Low hfe ones often have less noise and higher early voltae so high hfe is not the only parameter.
Read this and start to understand :http://www.essex.ac.uk/csee/research/audio_lab/malcolmspubdocs/J7 Fuzzy distortion.pdf
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