I don't think it's quite that simple because it matters where the error (or plus play) happen. A 1b who makes an error (or plus play) likely will not hurt (or help) as much a CF doing the same. If a 1b drops a ball or misses a grounder that's probably only one base given up whereas a CF doing the same is probably 2-3 bases and that's worth more (thinking linear weights).
Expanding on that logic to actually answer the question in a roundabout way, a CF making a plus play to rob a sinking liner might save one base but making an error might cost 2+ bases; whereas a 1b making a plus play might save 2+ bases (if it had gone down the line) but an error probably only cost 1 base.
In other words, overall, across all positions, on average, a plus play and an error probably cancel out and worth 1:1 but at an individual position it might be 2:1 one way or another