Thanks for the suggestion. I tried the Arduino-Tiny core as well, and am actually using it now, since there's not much point in switching back. It didn't help, but I did have a brain fart of sorts. I was thinking the ADC was 8 bit.. It's 10 bit.. So 235ish is totally within the correct range. It's within an acceptable margin of error of the correct reading.
As for the other ADC, I've actually encountered this on past ATTiny projects, and go figure, I forgot about it when designing my PCB for this project. "Pin 4"'s ADC doesn't seem to work, so I ran a jumper over to "pin 2", and changed the sketch to use pin 2. It now reads the same readings on both sensors.
The last time I encountered this, I was running an ATTiny on perfboard, I had a potentiometer going into that bum ADC and was using it to vary a PWM output to control a motor speed. Couldn't figure out why the motor speed wouldn't change until I finally tried a different ADC. That was at least 6 months ago, if not 9..
Oh well. I can move forward on my project now. Thanks for the reply.