No it isn't.
Frankly, what is ludicrous is having this comparing between the two, given that what they both show is that a competent manager can manage our club well if they have drive and energy, but to keep that up for a sustained period given the background carnage, is well-nigh impossible.
However, it's farcical to demean Pressley's Sixfields effort, too. Have we forgotten what it was like then, the carnage, the disruption, the abomination of ripping apart the fabric of the club... and that the manager had to pick that up? And that's even ignoring the fact we were starting from a position of negative points.
Notwithstanding that, even a comparison of player per player is disingenuous. Wilson was on the edge of being released, but Pressley saw enought to keep him and, moreover, adapt his preferred one striker formation to find him a place. Moussa has been a disaster since leaving CCFC, but Pressley got the best out of him. Ditto, Clarke was in and out of a promotion winning side, so not considered worthy of a place in such a team. Pressley, again, got the best out of him. Then we have the likes of Aaron Martin, who wasn't even with us in the Sixfields season. Pressley moved heaven and earth to try and sign him however, and eventually did the following season. Why? Because he was better, in Pressley's mind, then the centre backs he had available. Mowbray, meanwhile, released him... considering the centre backs at the club of a higher standard than Martin. Just how bad, then, would Mowbray have considered a defence of Webster and Jordan Clarke?
Then we have Billy Daniels, Danny Seaborne, Connor Thomas (released by Mowbray as worse than Gadzhev) and the like.
To run down Pressley is as much, if not more, of a disgrace than running down Mowbray. Both had their faults, both tried their best for the club, both had periods of success, and both can have criticisms fairly levelled at them.
But don't, just don't, diminish the job Pressley did while we were at Sixfields. We might be at a low ebb now, but without the manager being able to bond the players together, and get them playing some sensational stuff, things could be even worse than they are now.