CV181-z's Black Treasures in Cary SLP-05?

I am running the above with great success in a Modwright Transporter. Now I am wondering, if I could also use them in my Cary SLP-05.

Does anybody have any information on this or tried it?

A recent TNT article highlights the difference and hence I am hesitant just dropping them in.

"This is why the CV181Z might not be a drop in replacement for the 6SN7. Typical 6SN7 heaters draw about 0.6A and the CV181z draws about 0.9A (900mA), the old Mullard CV181 drew 950mA. This 50% increase in heater current amounts to 0.6A for a pair of CV181 in a circuit, which as you can see represents the load of a whole extra double triode."

Thanks