No. Box 5 and 9b are not the same.
Box 5 - Generally, this shows the employee’s investment in the contract (after-tax contributions), if any, recovered tax free this year; the portion that’s your basis in a designated Roth account; the part of premiums paid on commercial annuities or insurance contracts recovered tax free; the nontaxable part of a charitable gift annuity; or the investment in a life insurance contract reportable under section 6050Y. This box doesn’t show any IRA contributions. If the amount shown is your basis in a designated Roth account, the year you first made contributions to that account may be entered in box 11.
Box 9b - For a life annuity from a qualified plan or from a section 403(b) plan (with after-tax contributions), an amount may be shown for the employee’s total investment in the contract. It is used to compute the taxable part of the distribution. See Pub. 575.
On the Form 1040 the amount from box 2a of the Form 1099-R is entered on Line 4b if from an IRA distribution. On Line 4d if from pensions and annuities.
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