Probably not, but as I explained to the apprentice here the other day I like to know the reasons for things. We were doing a bit of a stock take and despite 2 years of training he didn't know the difference between the smaller 5 ton jacks and the older larger 9 ton jacks. I would never have went that long without enquiring why we had 2 different sizes in stock. It's the same thing for the steel boards, why are they slightly wider than timber, nobody can explain that one to me not even the manufacturers.
The couple of jacks we have here with the corners off them came from god knows where and feel a lot lighter and cheaper than our usual ones.