Lennon and N'Koudou joined from Everton and Tottenham respectively and both January signings have been pitched straight into action, with Lennon involved in the Clarets' 1-1 draw with league leaders Manchester City last weekend.
Cork is confident they will help Sean Dyche's side overcome the dip in form which has seen them go 10 matches without a win in all competitions.
"They have been great so far," the ever-present midfielder told Sky Sports News. "They are something completely different to what we have had before. You can tell the pace and liveliness of them when they have been on the pitch.
"They have done brilliant for us. It just gives us a different dimension for us to use.
"Sometimes it is nice to have a little change and something new and to keep everyone on their toes, to give everyone a boost to know we have still got a lot of work until the end of the season."