Have Lee rebranded their old ND hard grads as very hard ND grads ?

[bitm2007]

I have just received my first Lee very hard grad (ND 0.6). I can't tell the difference between it and the 0.6 Lee hard ND grad's I purchased in 2013 and 2016 !

When Lee expanded their range to include medium and very hards ND grads (as well as soft and hard transitions), was their old hard grad renamed as a very hard grad ?

 

[Hector1970]

I guess it would be hard to tell.
They'd be better making very hard to scratch ND grads as opposed to very hard grads.
Not to mention their glass filters - I'm sick of breaking them. I've moved to Kase