"remember to use a resistor and a capacitor right next to the receiver." - This is where I'm lost. I have no idea what those are, where to find it, and which ones to use. I heard of them. Once again I'm no robot builder but I can solder.
Look at the Datasheet
bottom right on the first page under the heading "APPLICATION CIRCUIT"
(it doesn't matter that it isn't for the exact TSOPxxxx component).
If you go with 10µF (micro-Farad) for the capacitor and 100R (100 Ohm) for the resistor you're in the green.
Solder them as close as physical possible to the new TSOPxxxx and don't use a bit more extension wire than you need, as that would just be collecting noise and migth even behave as an inductance (bad).
If you cannot get the exact TSOPxxxx you allready have mounted, make sure how the pinout is, as it differs - find the datasheet for what you get and mount Vcc to Vcc, Gnd to Gnd and Signal to Signal.
Luckily their outputs are what's called common collector, so they can be mounted in parallel without any problems - just make sure one of them cannot register any backscatter when the other is pointed at, or it might confuse the system (or not - you'll have to experiment).