ADXRS610 and ADXRS620 differences

We currently use the ADXRS610 in our products.  Our manufacturer cannot get these and  has suggested we use the ADXRS620.  THe spec sheets are virtually identical except for the following statement, the ADXRS610 states, "A  single external resistor can be used to lower the scale factor." We use this capability but it is not mentioned in the ADXRS620 datasheet.  Is it still possible do do this with  the ADXRS620?

Thanks for any help,

Denis