Yes, most of the 142 that I built or serviced used these springs. More or less.
If you want to get close on the 242, you need to figure the wheel rate of both cars. The 142 has about a 60% wheel rate, maybe a little more.
Down and dirty measurement is to move the wheel 4 in and measure the spring perch travel. The ratio of movement is the ratio of effective spring rate....
The 242 is near 90% ..