mastech ms8040 vs M9803R

[DiTBho]

I am a bit confused, M9840 and M9803R look the same, or very similar, just in different color.
I also wonder if the RS232 protocol is the same or different.

[DiTBho]

M9803R
FEATURES
•   Display: Digital and analog display, 3999 counts and 42 segments bar graph, digit is 18mm high
•   Autorange and manual range
•   Data hold, MAX/MIN relative measurement
•   Storage data display/recall
•   True RMS for AC voltage and current
•   Back light
•   ADP measurement: 400mV±0.3%, 10 DIGIT/1mV DC
•   Continuity test
•   Diode test
•   RS232C standard interface
•   Power source: AC or DC power supply
SPECIFICATIONS
Function   Range   Accuracy
DC Voltage
400m/4V/40/400/1000V   ±0.3%
AC Voltage True RMS   4/40/400/750V   ±0.8%
DC Current   4/40/400mA
10A   ±0.8%
±1.5%
AC Current True RMS

4/40/400mA
10A   ±1.5%
±2.0%
Resistor   400/4k/40k/400kΩ
4MΩ
40MΩ   ±0.5%
±1.0%
±1.5%
Capacitance   4n/40n/400n/4µ/20µF
20µF ~ 40µF   ±2.0%
±5.0%
Frequency   100/1k/10k/100k/600kHz   ±0.1%
hFE   1 ~ 1000