To the best of my knowledge there are no restrictions for blades in table tennis. There are restrictions for rubbers but imho not for blades; so yes, you can continue using your blade.
That's actually what I thought, too, until my colleague bought some cheap blades in Aliexpress made in China.
You won't believe what consistent quality you can get in the $27-$40 range.
I'd say 2 g difference on a ca. 90 g blade is not a big deal as the two rubbers probably would add another ca. 100 g. So we would be talking 2 g in relation to ca. 190 g.