Hey there!
A few similarities between Pseudoscorpions and scorpions include:
1. Both are arachnids
2. Have pedipalps in front of their body
3. Have hard exoskeletons
4. Have pear shaped bodies
Although there are some similarities, there are several differences as well. A common difference is that Pseudoscorpions can't sting their prey while scorpions on the other hand, can.
Thank you!