No. It does not matter. Both are taxed the same. In reality, line 4 is for IRA's and line 5 is for pensions and 401ks.
However, if this is being treated as a pension instead of an 401k Settlement the most likely reason is because of how you answered the questions that followed your 1099-R entries. If you answered yes to was this a periodic payment or that you received it monthly, it would be treated as a pension.
To fix this, you can go back through the questions after the 1099-R and double check your answers being sure to say no, you did not receive this monthly or as a periodic payment.
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