The standard pick value chart you can find via google suggests the 61st is valued at 292 points, the 29th is worth 640 points. the combined 932 value gets you pick number 18.
29th and 63rd gets the same, pick number 18.
The pick value charts are very rough though, they normally low ball so I would have though the 29th and 61st is more more likely to get you the 20th overall selection.
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