The short answer to your question is: no they are not equal. That being said, they do both share similarities.
Both units have very good populations of elk and fair populations of deer. Both units share the same genetics and, in theory, share the same ability to grow big bulls. Both units have good habitat, with semi-rugged terrain but both units also have too many roads. These are basically where the similarities end and the stark differences begin.
Unit 61 is a limited entry unit with a limited number of bull hunters. In my opinion Unit 61 is managed more like a general unit than the other limited entry units, specifically those in the NW corner of the state. Unit 61 offers issues many more tags than the other limited units but one can still find lots of big bulls. You can thank the quality habitat and ruggedness for that.
The elk in Unit 61 act vastly different than the elk in Unit 62. Unit 62 elk are prone to be very quiet. Unit 61 elk are very vocal, feed longer in the daylight hours and are much more visible. This can be directly attributed to the reduced hunting pressure.
Both units can and do produce big bulls every year. Elk do cross the Divide Road regularly and many hunters seem to put their hope in elk doing this, so that they can try to catch them crossing. A waste of time IMO. A hunter should have no problem killing an elk every year in Unit 62. They just need to be smarter and hunt harder than the masses. The simple fact is that there are 'masses' of hunters in Unit 62, just like Tx stated.
The last answer to your question all depends on what you consider 'quality'. Is it the same number of equally big bulls in both Units? Unit 61 has more. Is it less competition and pressure to shoot the first bull you see? Unit 61 has less. Is it seeing lots of elk? Both units offer this. Is it a chance to harvest a 6x6 bull? Both units offer this. Is it the chance to see 'classic' elk behavior? Unit 61 offers more of this.
You are going to get many different answers to your question. This is my opinion. Best of luck to you if you get to hunt either unit.