Fax travel to the Principality on the Saturday after Easter for a National League One fixture, with the NRC contest at the Shay the hot favourite for Sky TV coverage the following Thursday.
"It's going to be a tough couple of games," said Fax boss Matt Calland, who watched a weakened side give up the club's unbeaten record with a 38-16 loss at Whitehaven yesterday.
"They're a quality, full time side and the tapes I've seen of them so far this year suggest they're going to be really strong.
"But in any cup competition you look for home advantage and we've got that, which is a big positive.
"Playing the same team twice so close together is never ideal but that's the luck of the draw."
Calland described yesterday's trip to the Cumbrian coast, which saw eight of Fax's likely starting 13 left at home, as a "very, very bad day at the office".
But he defended his decision to field a makeshift line up, highlighting the importance of Thursday night's National League One opener against Sheffield at the Shay.
"I made a lot of changes and the lads who came in didn't really perform," admitted Calland, whose original plans were disrupted by the late withdrawal of Graham Holroyd with a virus.
"It was done with one eye on the three games we have coming up in the next two weeks.
"We came to win and it was still a strong side.
"We have a squad who have been doing the job for us over the last few weeks but yesterday it didn't work out for us.
"But we dropped our standards unbelievably and we can't afford to start thinking we only have to turn up to win.
"Whitehaven are always hard to beat and I have still to get a win here, either as a player or a coach.
"The pitch was like a cowfield and they played the conditions a lot better than we did.
"I think some of our players turned up, looked at the conditions, and didn't fancy it."
Forward Danny Heaton was a surprise inclusion in the Fax line up, playing just 48 hours after being released from prison as a result of his continued off-field problems.
"I thought Danny went alright," said Calland, who saw star centre Jon Goddard leave the fray with concussion.

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