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IR detectors are digital out - either they detect 38KHz IR signal and output low (0V)
or they do not detect any and output high (5V). Photocells act like resistors, the
resistance changes depending on how much light they are exposed to.
What You Can Measure
As you can see from these datasheet graphs, the peak frequency detection is at 38
KHz and the peak LED color is 940 nm. You can use from about 35 KHz to 41 KHz but
the sensitivity will drop off so that it won't detect as well from afar. Likewise, you
can use 850 to 1100 nm LEDs but they won't work as well as 900 to 1000nm so make
sure to get matching LEDs! Check the datasheet for your IR LED to verify the
wavelength.
Try to get a 940nm - remember that 940nm is not visible light!