I am not sure if this need to send them. vs I wonder if this need to send them.

Some examples from the web:

• I am not sure if this is true of the United States, but Europe certainly is a major producer of bananas.
• Mr President, I am not sure if many questions have been asked.
• I am not sure if you have the balance right.
• I am not sure if we need to follow up on what has been said, and on what basis we can do so, regarding the problem of minorities.
• Because I am not sure if you heard that, but there is going to be a wedding.
• I am not sure if Ted have spoken to lately
• To be honest, I am not sure if it was your girlfriend asking or your chief of staff.
• I am not sure if we should go into this point too critically in public, given that jobs are at stake.
• However, I am not sure if we should give more money for research.
• I am not sure if you know what a Colombian paramilitary is.
• I am not sure if that remark was ironic but I will take it at face value.
• So I am not sure if your question was meant for me, but I will assume it is.
• I am not sure if I can do that.
• Yes, I am not sure if I care.
• I am not sure if their status has gone up a whole pile in the meantime.
• Mr President, I am not sure if the interpretation missed it.
• I am not sure if these are particularly necessary, but on the other hand they do no harm.
• Mr President, I am not sure if I can respond to all of the Members.
• I am not sure if the pocket calculators are part of the campaign at euro group level.
• I would like it to happen, but I am not sure if it will.

Some examples from the web:

• I wonder if this temp is the same on my other foot.
• I wonder if this is how katie holmes felt.
• I wonder if this is true.
• I wonder if this particular program is the right fit for you.
• I wonder if this is how Edward and Bella felt.
• I wonder if this is what Erin Brockovich felt like.
• - But I wonder if this will be enough.
• I wonder if this ought to be mixed with something.
• I wonder if this sash will match.
• I wonder if this whole thing's a disaster.
• I wonder if this is how parents feel.
• I wonder if this could be one of your artifacts.
• I wonder if this is our local friendly burglar.
• I wonder if this is related to that...
• I wonder if this human face whitlow could become a TV talent.
• I wonder if this place was ever nice.
• I wonder if this has anything to do with my best friend.
• I wonder if this is the emotional trauma that caused his amnesia.
• I wonder if this is really the role of the CAP.
• I wonder if this is not discrimination against British drivers with a valid driving licence due to age restrictions across the EU.