OK so here are some numbers from measuring targets printed from PS CS4, ACPU, ID & Qimage on a Windows 7 64 bit system
Looking at the figures there is no significance colour difference between all four program's output(just ACPU resizing the targets). Any differences could be down to measurement and printer accuracy.
Methodology
Target TC2.83 RGB i1 printed twice from CS4 & ACPU, each print out measured twice.
Printing on Epson 3800 on Jessops gloss paper, Windows 7 64bit.
dE2000 measurements with Eye-One Pro revB in strip mode with PMP 5.0.10
Measurement accuracy, comparing two passes of same target;
Average delta: 0.14
Standard deviation (dE): 0.12
Average delta: 0.12
Standard deviation (dE): 0.10
Average delta: 0.13
Standard deviation (dE): 0.08
Average delta: 0.14
Standard deviation (dE): 0.11
Accuracy of print to print accuracy from same application;
Average delta: 0.36
Standard deviation (dE): 0.24
Average delta: 0.37
Standard deviation (dE): 0.24
Average delta: 0.25
Standard deviation (dE): 0.15
Average delta: 0.22
Standard deviation (dE): 0.15
CS4 - ACPU
Average delta: 0.53
Standard deviation (dE): 0.26
Average delta: 0.29
Standard deviation (dE): 0.18
Average delta: 0.43
Standard deviation (dE): 0.24
Average delta: 0.38
Standard deviation (dE): 0.23
CS4 - InDesign CS4
(Document in AdobeRGB, placed untagged target at same size)
Average delta: 0.43
Standard deviation (dE): 0.24
CS4 - Qimage
Average delta: 0.35
Standard deviation (dE): 0.19