Yes, it is possible to owe additional taxes with additional W2 if there are not enough taxes taken out of either the W2, 1099R, or both, Keep in mind, combined income from both income sources could put you into a higher tax bracket that may require you to request more income tax to be withheld so you are not faced with an additional tax burden in tax season.
To help you make a determination on how much tax to withhold, please review this link from the Irs.it is a form for you to submit to your W2 employer to withhold more taxes.. There is also a worksheet to help you determine how much tax to withhold. i don't have one of these for your 1099R but if you complete the worksheet in the W2, you may get an idea on how much tax to withhold on your 1099R as well. Then you can contact the trustee for the pension plan to withhold more tax.
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