in short, yes that TX can work with the trucks, but that TX will not work with those RX installed on the trucks. to get that controller to work in those trucks you will need to get a receiver compatible with your TX.
is your MX-3 the 75mhz version or the 2.4ghz? if it is a 75mhz (crystals) version i would highly suggest getting a 2.4ghz radio system, if yours is the 2.4ghz version i would try to find a compatible receiver.
if yours is the 75mhz version or if it is difficult to find a receiver compatible with the 2.4ghz may look into this radio system:
44$ GT3C (has a rechargeable battery)
https://www.amazon.com/FS-GT3C-3Channel-Transmitter-FS-GR3E-Receiver/dp/B07C9ZGMG9/ref=asc_df_B07C9ZGMG9/?tag=hyprod-20&linkCode=df0&hvadid=312184153387&hvpos=1o1&hvne tw=g&hvrand=12238139512768525796&hvpone=&hvptwo=&h vqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9021359 &hvtargid=aud-829758849484la-569828763097&psc=1
37$ GT3B (uses 8 AA batteries.)
https://www.amazon.com/GT3B-2-4G-Fly...WAXXVX1MYHKH6Y