In modern airlines there are ADIRU units which couple IRUs with an air data computer to feed the complete flight data package directly to the EFIS.
I would have to aruge it's close but not quite right. As has already been pointed out, a INS will navigate while a IRS won't. The IRS/ADIRU provides information to the FMC and the FMC then used the "refined" position it calculates to navigate. That information is then used in the ND.
Well I would say the ADIRU sends information to the FMC which ignores it in favour of the GPS for navigation. But the AD part sends air data direct to the PFD.
And I would like to agree with 411A. The original Litton was better than the Carousel. It was whirring gyros but more tech involved, and could couple to the FMC, and be programmed by it (in 1976). But the carousel lasted longer! If you didn't punch its buttons too hard!