Should you do a HIT by the same Requester if the title is similar and the HIT is similar to one you have done previously, but the pay and title are a little different, if the HIT does NOT say you can Not do the Hit again? EX. a Hit title says Survey on work for .25 then another is Work Survey .30 by same Requester, and some of the stuff in the survey is similar to the previous survey, but the instructions do not state you can only do the survey once. These are usually not posted on the same day either. I have not done any so far for fear of reject even though it doesn't say you're not suppose to do more than one. Thank you!
That shouldn't be a problem. Whether or not you feel you can risk it is up to you. Contacting them might help. No telling whether they will answer though.
I've noticed that some of the survey HITs tell you if you're eligible in the disclaimer/consent form/etc. and some wait until you're actually a few questions in. Whenever possible, so I don't hurt my return rate, I click the survey and answer a few questions first, then accept the HIT. The risk here is that it disappears before you accept it, though that has personally never happened to me while doing this.
Or is you really feel uncomfortable about it, you can return the HIT after you begin it. I usually find it the payment is different and they have allowed me to accept the survey, it has been changed in some way. If it is too similar I do return them. Better than abandoning them and better than rejection. Once I did a survey that I realized was exactly as one I did before. I contacted the requester after I finished because it had been submitted. The requester was kind to pay me for honesty.