Could I connect 1000 gallons per minute pump and a 3000 gallon per minute pump to the same suction header

How big is the header and what is the supply pressure or is this a dry suction? 4,000 GPM is a lot of water. Here is a flow chart for pressure flow
Pressure Flow in GPM through pipe ID in inches
PSI 1" 1.25" 1.5" 2" 2.5" 3" 4" 5"
20 26 47 76 161 290 468 997 2895
30 32 58 94 200 360 582 1240 3603
40 38 68 110 234 421 680 1449 4209
50 43 77 124 264 475 767 1635 4748
60 47 85 137 291 524 846 1804 5239
75 53 95 153 329 591 955 2035 5910
100 62 112 180 384 690 1115 2377 6904
125 70 126 203 433 779 1258 2681 7788
150 77 139 224 478 859 1388 2958 8593
200 90 162 262 558 1004 1621 3455 10038