Fujifilm X70 has a
16.0MP APS-C (23.6 x 15.6 mm ) sized CMOS X-TRANS II sensor and features EXR Processor II processor. On the other hand, Fujifilm X-A3 has a
24.0MP APS-C (23.5 x 15.7 mm ) sized CMOS sensor and features EXR Processor II processor.
Fujifilm X-A3's sensor provides 8MP more than Fujifilm X70's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the X70 and X-A3 sensor size comparison.
Fujifilm X70 and Fujifilm X-A3 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.