The action in Yast of setting card 1 as the primary DOES change its number. The primary card automatically becomes card 0 and stops working. The old card 0 becomes card 1 and starts working.

aplay -L with the Lynx card as primary gives:

null
Discard all samples (playback) or generate zero samples (capture)
default:CARD=PCH
HDA Intel PCH, ALC221 Analog
Default Audio Device
front:CARD=PCH,DEV=0
HDA Intel PCH, ALC221 Analog
Front speakers
surround40:CARD=PCH,DEV=0
HDA Intel PCH, ALC221 Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=PCH,DEV=0
HDA Intel PCH, ALC221 Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=PCH,DEV=0
HDA Intel PCH, ALC221 Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=PCH,DEV=0
HDA Intel PCH, ALC221 Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PCH,DEV=0
HDA Intel PCH, ALC221 Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
null
Discard all samples (playback) or generate zero samples (capture)

aplay -L with the Haswell card as primary gives:

null
Discard all samples (playback) or generate zero samples (capture)
default:CARD=PCH
HDA Intel PCH, ALC221 Analog
Default Audio Device
front:CARD=PCH,DEV=0
HDA Intel PCH, ALC221 Analog
Front speakers
surround40:CARD=PCH,DEV=0
HDA Intel PCH, ALC221 Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=PCH,DEV=0
HDA Intel PCH, ALC221 Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=PCH,DEV=0
HDA Intel PCH, ALC221 Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=PCH,DEV=0
HDA Intel PCH, ALC221 Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PCH,DEV=0
HDA Intel PCH, ALC221 Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
null
Discard all samples (playback) or generate zero samples (capture)
SO NO APPARENT DIFFERENCE.

speaker-test -c2 -Dplug:front -t wav -l1 with the Haswell card as primary generates a repeating stream of:

Playback device is plug:front
Stream parameters are 48000Hz, S16_LE, 2 channels
WAV file(s)
Playback open error: -2,No such file or directory
Playback open error: -2,No such file or directory
Playback open error: -2,No such file or directory
Playback open error: -2,No such file or directory

Thanks for your attention

ROB