power cords for 220v

No, as long as the plug fits your mains outlet.

I socnd that, all my power cords are US type and I am using them for 220 volt no problem.

When i buy the Tice powercords i must change to Schuko and a 20A plug.
So both are being replaced.

The electricity supply in my area is also 220V. I have purchased and used a number of after the market power cord made in US with no problem. The only thing you need to concern yourself is that your property insurance company may deem it as using some sort of non-standard wiring. In my area I sometimes see the dealers having those US cords marked as "For Export Only" to avoid possible legal infrigement issue. Can't say if this will apply to your country however.

Coming from a 240V 50hz country Ive also wondered about this. Not so much the voltage but the line frequency. Aside from the supposed better shielding and rejection of after market powercords, Ive heard more than once about these being tuned in materials and length for electrical 'resonances'.

If this has any truth, and the 'tunings' are frequency dependent then surely a cable built for 60hz will not benefit from this aspect when used with 50hz?

Food for thought.