That really depends entirely upon the circuit you'd be using them in. I'm not familiar with your amp - but I might suggest you ask the manufacturer. Matched power tubes in circuits that are individually biased, for instance, won't make any difference assuming the bias is accurate and identical. Matched tubes in a parallel SET circuit wouldn't make any difference. I think they become more important in preamp circuits, but I know too little to make my speculations dangerous. Someone with more grey matter between the ears can correct me here.
As an addendum to your question - I've always wondered this - When you purchase a set of matched tubes for a circuit that actually does take advantage of the fact that they are closely matched...as you play stereo music through them, which sometimes taxes each channel slightly differently, don't the tubes become gradually mismatched according to that uneven demand on them? If so, and you start out with matched tubes, how long before they are no longer very close?
As an addendum to your question - I've always wondered this - When you purchase a set of matched tubes for a circuit that actually does take advantage of the fact that they are closely matched...as you play stereo music through them, which sometimes taxes each channel slightly differently, don't the tubes become gradually mismatched according to that uneven demand on them? If so, and you start out with matched tubes, how long before they are no longer very close?